Coincidence measurement of the nonmesonic weak decay of 12ΛC

M. J. Kim; S. Ajimura; K. Aoki; A. Banu; H. Bhang; T. Fukuda; O. Hashimoto; J. I. Hwang; S. Kameoka; B. H. Kang; E. H. Kim; J. H. Kim; T. Maruta; Y. Miura; Y. Miyake; T. Nagae; M. Nakamura; S. N. Nakamura; H. Noumi; S. Okada; Y. Okayasu; H. Outa; H. Park; P. K. Saha; Y. Sato; M. Sekimoto; S. Shin; T. Takahashi; H. Tamura; K. Tanida; A. Toyoda; K. Tsukada; T. Watanabe; H. J. Yim

doi:10.1016/j.physletb.2006.08.012

Coincidence measurement of the nonmesonic weak decay of ¹²_ΛC

M. J. Kim, S. Ajimura, K. Aoki, A. Banu, H. Bhang, T. Fukuda, O. Hashimoto, J. I. Hwang, S. Kameoka, B. H. Kang, E. H. Kim, J. H. Kim, T. Maruta, Y. Miura, Y. Miyake, T. Nagae, M. Nakamura, S. N. Nakamura, H. Noumi, S. OkadaY. Okayasu, H. Outa, H. Park, P. K. Saha, Y. Sato, M. Sekimoto, S. Shin, T. Takahashi, H. Tamura, K. Tanida, A. Toyoda, K. Tsukada, T. Watanabe, H. J. Yim

School of Earth System Sciences

Research output: Contribution to journal › Article › peer-review

61 Scopus citations

Abstract

We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of ¹²_ΛC produced via the (π⁺, K⁺) reaction in coincidence measurement. The Λ p → n p and Λ n → n n modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers N_{n n} and N_{n p}, the ratio Γ_n / Γ_p of the partial decay widths Γ_n (Λ n → n n) and Γ_p (Λ p → n p) of ¹²_ΛC was extracted to be 0.51 ± 0.13 (stat) ± 0.05 (syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γ_n / Γ_p ratio of ¹²_ΛC (p-shell) is close to that of ⁵_ΛHe (s-shell). The results are consistent with those of recent theoretical calculations.

Original language	English
Pages (from-to)	28-33
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	641
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2006.08.012
State	Published - 28 Sep 2006

Keywords

C
Nonmesonic weak decay
Γ (Λ n → n n) / Γ (Λ p → n p)

Access to Document

10.1016/j.physletb.2006.08.012

Cite this

Kim, M. J., Ajimura, S., Aoki, K., Banu, A., Bhang, H., Fukuda, T., Hashimoto, O., Hwang, J. I., Kameoka, S., Kang, B. H., Kim, E. H., Kim, J. H., Maruta, T., Miura, Y., Miyake, Y., Nagae, T., Nakamura, M., Nakamura, S. N., Noumi, H., ... Yim, H. J. (2006). Coincidence measurement of the nonmesonic weak decay of ¹²_ΛC. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 641(1), 28-33. https://doi.org/10.1016/j.physletb.2006.08.012

@article{60947a5e95104a149440d820f87b19a3,

title = "Coincidence measurement of the nonmesonic weak decay of 12ΛC",

abstract = "We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of 12ΛC produced via the (π+, K+) reaction in coincidence measurement. The Λ p → n p and Λ n → n n modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nn n and Nn p, the ratio Γn / Γp of the partial decay widths Γn (Λ n → n n) and Γp (Λ p → n p) of 12ΛC was extracted to be 0.51 ± 0.13 (stat) ± 0.05 (syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn / Γp ratio of 12ΛC (p-shell) is close to that of 5ΛHe (s-shell). The results are consistent with those of recent theoretical calculations.",

keywords = "C, Nonmesonic weak decay, Γ (Λ n → n n) / Γ (Λ p → n p)",

author = "Kim, \{M. J.\} and S. Ajimura and K. Aoki and A. Banu and H. Bhang and T. Fukuda and O. Hashimoto and Hwang, \{J. I.\} and S. Kameoka and Kang, \{B. H.\} and Kim, \{E. H.\} and Kim, \{J. H.\} and T. Maruta and Y. Miura and Y. Miyake and T. Nagae and M. Nakamura and Nakamura, \{S. N.\} and H. Noumi and S. Okada and Y. Okayasu and H. Outa and H. Park and Saha, \{P. K.\} and Y. Sato and M. Sekimoto and S. Shin and T. Takahashi and H. Tamura and K. Tanida and A. Toyoda and K. Tsukada and T. Watanabe and Yim, \{H. J.\}",

year = "2006",

month = sep,

day = "28",

doi = "10.1016/j.physletb.2006.08.012",

language = "English",

volume = "641",

pages = "28--33",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1",

}

Kim, MJ, Ajimura, S, Aoki, K, Banu, A, Bhang, H, Fukuda, T, Hashimoto, O, Hwang, JI, Kameoka, S, Kang, BH, Kim, EH, Kim, JH, Maruta, T, Miura, Y, Miyake, Y, Nagae, T, Nakamura, M, Nakamura, SN, Noumi, H, Okada, S, Okayasu, Y, Outa, H, Park, H, Saha, PK, Sato, Y, Sekimoto, M, Shin, S, Takahashi, T, Tamura, H, Tanida, K, Toyoda, A, Tsukada, K, Watanabe, T & Yim, HJ 2006, 'Coincidence measurement of the nonmesonic weak decay of ¹²_ΛC', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 641, no. 1, pp. 28-33. https://doi.org/10.1016/j.physletb.2006.08.012

TY - JOUR

T1 - Coincidence measurement of the nonmesonic weak decay of 12ΛC

AU - Kim, M. J.

AU - Ajimura, S.

AU - Aoki, K.

AU - Banu, A.

AU - Bhang, H.

AU - Fukuda, T.

AU - Hashimoto, O.

AU - Hwang, J. I.

AU - Kameoka, S.

AU - Kang, B. H.

AU - Kim, E. H.

AU - Kim, J. H.

AU - Maruta, T.

AU - Miura, Y.

AU - Miyake, Y.

AU - Nagae, T.

AU - Nakamura, M.

AU - Nakamura, S. N.

AU - Noumi, H.

AU - Okada, S.

AU - Okayasu, Y.

AU - Outa, H.

AU - Park, H.

AU - Saha, P. K.

AU - Sato, Y.

AU - Sekimoto, M.

AU - Shin, S.

AU - Takahashi, T.

AU - Tamura, H.

AU - Tanida, K.

AU - Toyoda, A.

AU - Tsukada, K.

AU - Watanabe, T.

AU - Yim, H. J.

PY - 2006/9/28

Y1 - 2006/9/28

N2 - We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of 12ΛC produced via the (π+, K+) reaction in coincidence measurement. The Λ p → n p and Λ n → n n modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nn n and Nn p, the ratio Γn / Γp of the partial decay widths Γn (Λ n → n n) and Γp (Λ p → n p) of 12ΛC was extracted to be 0.51 ± 0.13 (stat) ± 0.05 (syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn / Γp ratio of 12ΛC (p-shell) is close to that of 5ΛHe (s-shell). The results are consistent with those of recent theoretical calculations.

AB - We have measured the angular correlation of the pair nucleons np and nn emitted from the nonmesonic weak decay (NMWD) of 12ΛC produced via the (π+, K+) reaction in coincidence measurement. The Λ p → n p and Λ n → n n modes were clearly identified by measuring the back-to-back correlation of the emitted nucleon pairs which is the characteristic of two-body kinematics. From the measured nucleon pair numbers Nn n and Nn p, the ratio Γn / Γp of the partial decay widths Γn (Λ n → n n) and Γp (Λ p → n p) of 12ΛC was extracted to be 0.51 ± 0.13 (stat) ± 0.05 (syst); this result is almost free from the ambiguity due to the nuclear final state interaction and 3-body decay process, which were inherent in the previous results. The obtained Γn / Γp ratio of 12ΛC (p-shell) is close to that of 5ΛHe (s-shell). The results are consistent with those of recent theoretical calculations.

KW - C

KW - Nonmesonic weak decay

KW - Γ (Λ n → n n) / Γ (Λ p → n p)

UR - https://www.scopus.com/pages/publications/33748443024

U2 - 10.1016/j.physletb.2006.08.012

DO - 10.1016/j.physletb.2006.08.012

M3 - Article

AN - SCOPUS:33748443024

SN - 0370-2693

VL - 641

SP - 28

EP - 33

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1

ER -

Coincidence measurement of the nonmesonic weak decay of ¹²_ΛC

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this